Compilare: user.cpp: In function ‘std::vector<int> mul(std::vector<int>&, std::vector<int>&)’: user.cpp:59:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < c.size(); ++i) c[i] = nc[i].real() + 0.5; ~~^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:90:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < v.size(); ++i) ~~^~~~~~~~~~ user.cpp:65:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bacterii2.in", "r", stdin); ^ user.cpp:66:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bacterii2.out", "w", stdout); ^